Implement hpx::experimental::for_each_index (P4150)

Author: arpittkhandelwal

libs/core/algorithms/CMakeLists.txt

@@ -54,6 +54,7 @@ set(algorithms_headers
     hpx/parallel/algorithms/fill.hpp
     hpx/parallel/algorithms/find.hpp
     hpx/parallel/algorithms/for_each.hpp
+    hpx/parallel/algorithms/for_each_index.hpp
     hpx/parallel/algorithms/for_loop.hpp
     hpx/parallel/algorithms/for_loop_induction.hpp
     hpx/parallel/algorithms/for_loop_reduction.hpp

libs/core/algorithms/include/hpx/parallel/algorithm.hpp

@@ -55,6 +55,7 @@
 
 // Parallelism TS V2
 #include <hpx/parallel/algorithms/ends_with.hpp>
+#include <hpx/parallel/algorithms/for_each_index.hpp>
 #include <hpx/parallel/algorithms/for_loop.hpp>
 #include <hpx/parallel/algorithms/shift_left.hpp>
 #include <hpx/parallel/algorithms/shift_right.hpp>